Looks solid enough to me, and your AA and line widths look great. The way her mouth is shaped and positioned it looks like she is hiding something in her mouth, sort of weird. Also there is a bit of optical illusion with her hair over her neck at the base of her skull that makes it look a little like the neck just shoots straight into the back of her jaw there, if that makes any sense. There is one jaggy pixel on the right side of her eye, where the white meets the skintone, that looks slightly out of place to me.
Nice work so far!